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Question

The strength of the oxyacids decreases in the following order

A
HNO3>H3PO4>H3AsO4>H3SbO4
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B
HNO3>H3PO4>H3SbO4>H3AsO4
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C
HNO3>H3PO4=H3AsO4>H3SbO4
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D
HNO3>H3PO4>H3AsO4=H3SbO4
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Solution

The correct option is A HNO3>H3PO4>H3AsO4>H3SbO4
Since all the elements are in the same oxidation state, electronegativity has to be considered. Electronegativity of the elements from N to Sb decreases generally. Thus N with high Electronegativity can donate the proton easily where as for Sb with least Electronegativity becomes difficult to donate proton. Thus (A) is the correct order.

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